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Livepatching changes for 6.10

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Merge tag 'livepatching-for-6.10' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching

Pull livepatching update from Petr Mladek:

 - Use more informative names for the livepatch transition states

* tag 'livepatching-for-6.10' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching:
  livepatch: Rename KLP_* to KLP_TRANSITION_*
This commit is contained in:
Linus Torvalds 2024-05-15 13:07:49 -07:00
commit 8c06da67d0
5 changed files with 35 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/linux/livepatch.h
View File

@ -18,9 +18,9 @@
#if IS_ENABLED(CONFIG_LIVEPATCH)
/* task patch states */
#define KLP_UNDEFINED -1
#define KLP_UNPATCHED 0
#define KLP_PATCHED 1
#define KLP_TRANSITION_IDLE -1
#define KLP_TRANSITION_UNPATCHED 0
#define KLP_TRANSITION_PATCHED 1
/**
* struct klp_func - function structure for live patching

2
init/init_task.c
View File

@ -199,7 +199,7 @@ struct task_struct init_task __aligned(L1_CACHE_BYTES) = {
.trace_recursion = 0,
#endif
#ifdef CONFIG_LIVEPATCH
.patch_state = KLP_UNDEFINED,
.patch_state = KLP_TRANSITION_IDLE,
#endif
#ifdef CONFIG_SECURITY
.security = NULL,

4
kernel/livepatch/core.c
View File

@ -973,7 +973,7 @@ static int __klp_disable_patch(struct klp_patch *patch)
if (klp_transition_patch)
return -EBUSY;
klp_init_transition(patch, KLP_UNPATCHED);
klp_init_transition(patch, KLP_TRANSITION_UNPATCHED);
klp_for_each_object(patch, obj)
if (obj->patched)
@ -1008,7 +1008,7 @@ static int __klp_enable_patch(struct klp_patch *patch)
pr_notice("enabling patch '%s'\n", patch->mod->name);
klp_init_transition(patch, KLP_PATCHED);
klp_init_transition(patch, KLP_TRANSITION_PATCHED);
/*
* Enforce the order of the func->transition writes in

4
kernel/livepatch/patch.c
View File

@ -95,9 +95,9 @@ static void notrace klp_ftrace_handler(unsigned long ip,
patch_state = current->patch_state;
WARN_ON_ONCE(patch_state == KLP_UNDEFINED);
WARN_ON_ONCE(patch_state == KLP_TRANSITION_IDLE);
if (patch_state == KLP_UNPATCHED) {
if (patch_state == KLP_TRANSITION_UNPATCHED) {
/*
* Use the previously patched version of the function.
* If no previous patches exist, continue with the

54
kernel/livepatch/transition.c
View File

@ -23,7 +23,7 @@ static DEFINE_PER_CPU(unsigned long[MAX_STACK_ENTRIES], klp_stack_entries);
struct klp_patch *klp_transition_patch;
static int klp_target_state = KLP_UNDEFINED;
static int klp_target_state = KLP_TRANSITION_IDLE;
static unsigned int klp_signals_cnt;
@ -96,16 +96,16 @@ static void klp_complete_transition(void)
pr_debug("'%s': completing %s transition\n",
klp_transition_patch->mod->name,
klp_target_state == KLP_PATCHED ? "patching" : "unpatching");
klp_target_state == KLP_TRANSITION_PATCHED ? "patching" : "unpatching");
if (klp_transition_patch->replace && klp_target_state == KLP_PATCHED) {
if (klp_transition_patch->replace && klp_target_state == KLP_TRANSITION_PATCHED) {
klp_unpatch_replaced_patches(klp_transition_patch);
klp_discard_nops(klp_transition_patch);
}
if (klp_target_state == KLP_UNPATCHED) {
if (klp_target_state == KLP_TRANSITION_UNPATCHED) {
/*
* All tasks have transitioned to KLP_UNPATCHED so we can now
* All tasks have transitioned to KLP_TRANSITION_UNPATCHED so we can now
* remove the new functions from the func_stack.
*/
klp_unpatch_objects(klp_transition_patch);
@ -123,36 +123,36 @@ static void klp_complete_transition(void)
klp_for_each_func(obj, func)
func->transition = false;
/* Prevent klp_ftrace_handler() from seeing KLP_UNDEFINED state */
if (klp_target_state == KLP_PATCHED)
/* Prevent klp_ftrace_handler() from seeing KLP_TRANSITION_IDLE state */
if (klp_target_state == KLP_TRANSITION_PATCHED)
klp_synchronize_transition();
read_lock(&tasklist_lock);
for_each_process_thread(g, task) {
WARN_ON_ONCE(test_tsk_thread_flag(task, TIF_PATCH_PENDING));
task->patch_state = KLP_UNDEFINED;
task->patch_state = KLP_TRANSITION_IDLE;
}
read_unlock(&tasklist_lock);
for_each_possible_cpu(cpu) {
task = idle_task(cpu);
WARN_ON_ONCE(test_tsk_thread_flag(task, TIF_PATCH_PENDING));
task->patch_state = KLP_UNDEFINED;
task->patch_state = KLP_TRANSITION_IDLE;
}
klp_for_each_object(klp_transition_patch, obj) {
if (!klp_is_object_loaded(obj))
continue;
if (klp_target_state == KLP_PATCHED)
if (klp_target_state == KLP_TRANSITION_PATCHED)
klp_post_patch_callback(obj);
else if (klp_target_state == KLP_UNPATCHED)
else if (klp_target_state == KLP_TRANSITION_UNPATCHED)
klp_post_unpatch_callback(obj);
}
pr_notice("'%s': %s complete\n", klp_transition_patch->mod->name,
klp_target_state == KLP_PATCHED ? "patching" : "unpatching");
klp_target_state == KLP_TRANSITION_PATCHED ? "patching" : "unpatching");
klp_target_state = KLP_UNDEFINED;
klp_target_state = KLP_TRANSITION_IDLE;
klp_transition_patch = NULL;
}
@ -164,13 +164,13 @@ static void klp_complete_transition(void)
*/
void klp_cancel_transition(void)
{
if (WARN_ON_ONCE(klp_target_state != KLP_PATCHED))
if (WARN_ON_ONCE(klp_target_state != KLP_TRANSITION_PATCHED))
return;
pr_debug("'%s': canceling patching transition, going to unpatch\n",
klp_transition_patch->mod->name);
klp_target_state = KLP_UNPATCHED;
klp_target_state = KLP_TRANSITION_UNPATCHED;
klp_complete_transition();
}
@ -218,7 +218,7 @@ static int klp_check_stack_func(struct klp_func *func, unsigned long *entries,
struct klp_ops *ops;
int i;
if (klp_target_state == KLP_UNPATCHED) {
if (klp_target_state == KLP_TRANSITION_UNPATCHED) {
/*
* Check for the to-be-unpatched function
* (the func itself).
@ -455,7 +455,7 @@ void klp_try_complete_transition(void)
struct klp_patch *patch;
bool complete = true;
WARN_ON_ONCE(klp_target_state == KLP_UNDEFINED);
WARN_ON_ONCE(klp_target_state == KLP_TRANSITION_IDLE);
/*
* Try to switch the tasks to the target patch state by walking their
@ -532,11 +532,11 @@ void klp_start_transition(void)
struct task_struct *g, *task;
unsigned int cpu;
WARN_ON_ONCE(klp_target_state == KLP_UNDEFINED);
WARN_ON_ONCE(klp_target_state == KLP_TRANSITION_IDLE);
pr_notice("'%s': starting %s transition\n",
klp_transition_patch->mod->name,
klp_target_state == KLP_PATCHED ? "patching" : "unpatching");
klp_target_state == KLP_TRANSITION_PATCHED ? "patching" : "unpatching");
/*
* Mark all normal tasks as needing a patch state update. They'll
@ -578,7 +578,7 @@ void klp_init_transition(struct klp_patch *patch, int state)
struct klp_func *func;
int initial_state = !state;
WARN_ON_ONCE(klp_target_state != KLP_UNDEFINED);
WARN_ON_ONCE(klp_target_state != KLP_TRANSITION_IDLE);
klp_transition_patch = patch;
@ -589,7 +589,7 @@ void klp_init_transition(struct klp_patch *patch, int state)
klp_target_state = state;
pr_debug("'%s': initializing %s transition\n", patch->mod->name,
klp_target_state == KLP_PATCHED ? "patching" : "unpatching");
klp_target_state == KLP_TRANSITION_PATCHED ? "patching" : "unpatching");
/*
* Initialize all tasks to the initial patch state to prepare them for
@ -597,7 +597,7 @@ void klp_init_transition(struct klp_patch *patch, int state)
*/
read_lock(&tasklist_lock);
for_each_process_thread(g, task) {
WARN_ON_ONCE(task->patch_state != KLP_UNDEFINED);
WARN_ON_ONCE(task->patch_state != KLP_TRANSITION_IDLE);
task->patch_state = initial_state;
}
read_unlock(&tasklist_lock);
@ -607,19 +607,19 @@ void klp_init_transition(struct klp_patch *patch, int state)
*/
for_each_possible_cpu(cpu) {
task = idle_task(cpu);
WARN_ON_ONCE(task->patch_state != KLP_UNDEFINED);
WARN_ON_ONCE(task->patch_state != KLP_TRANSITION_IDLE);
task->patch_state = initial_state;
}
/*
* Enforce the order of the task->patch_state initializations and the
* func->transition updates to ensure that klp_ftrace_handler() doesn't
* see a func in transition with a task->patch_state of KLP_UNDEFINED.
* see a func in transition with a task->patch_state of KLP_TRANSITION_IDLE.
*
* Also enforce the order of the klp_target_state write and future
* TIF_PATCH_PENDING writes to ensure klp_update_patch_state() and
* __klp_sched_try_switch() don't set a task->patch_state to
* KLP_UNDEFINED.
* KLP_TRANSITION_IDLE.
*/
smp_wmb();
@ -652,7 +652,7 @@ void klp_reverse_transition(void)
pr_debug("'%s': reversing transition from %s\n",
klp_transition_patch->mod->name,
klp_target_state == KLP_PATCHED ? "patching to unpatching" :
klp_target_state == KLP_TRANSITION_PATCHED ? "patching to unpatching" :
"unpatching to patching");
/*
@ -741,7 +741,7 @@ void klp_force_transition(void)
klp_update_patch_state(idle_task(cpu));
/* Set forced flag for patches being removed. */
if (klp_target_state == KLP_UNPATCHED)
if (klp_target_state == KLP_TRANSITION_UNPATCHED)
klp_transition_patch->forced = true;
else if (klp_transition_patch->replace) {
klp_for_each_patch(patch) {